Company profile · Builders
Mountside Construction Ltd
Mountside Construction Ltd is a 23-year-old private limited company registered in Harrow, company number 04883944, one of 793 building contractors in Harrow. Its next accounts are due at Companies House on 31 January 2027, and the CT600 for the period to 30 April 2026 is due at HMRC on 30 April 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 30 April 2025, as filed at Companies House.
Mountside Construction Ltd over the years
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets up £228K (+17.2%) on the year before, to £1.6M.
- Net assets rose in 8 of 9 year-on-year comparisons on record.
- Current assets of £1.5M against £47K owed within a year: more than 10 times cover.
- 2 employees on average, up from 1 the year before.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Apr 2025 | £1.6M | £1.5M | £47K | 2 | |
| 30 Apr 2024 | £1.3M | £1.1M | £1.4M | £103K | 1 |
| 30 Apr 2023 | £1.2M | £979K | £1.3M | £140K | 1 |
| 30 Apr 2022 | £851K | £919K | £79K | 1 | |
| 30 Apr 2021 | £649K | £673K | £40K | 1 | |
| 30 Apr 2020 | £613K | £818K | £226K | 1 | |
| 30 Apr 2019 | £182K | £356K | £178K | ||
| 30 Apr 2018 | £66K | £104K | £43K | ||
| 30 Apr 2017 | £53K | £88K | £42K | ||
| 30 Apr 2016 | £62K | £61K | £95K | £41K |
Where Mountside Construction Ltd is registered
The registered office is in Harrow (HA3), in the Harrow local authority area, London. Show HA3 8DD on a map.
Other trade companies in HA3
- M&M Team Solutions LimitedCleaning companies
- Asr234 LimitedCivil engineering
- Shine Bright With NV LtdMechanics and garages
- Direct Sparks LtdMachinery repair and installation
- Meral Decoration & Maintenance LtdPainters and decorators
- Add22 LtdCivil engineering
- Floyd Cleaners LimitedCleaning companies
- Amalia&Ioana LimitedBuilders
Shared registered office
46 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Mountside Construction Ltd files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 31 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 30 Apr 2027 | £375 |
| 3 to 6 months late | 1 May 2027 to 31 Jul 2027 | £750 |
| More than 6 months late | From 1 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 04883944
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 September 2003 (23 years ago)
- Registered office
- Alpha House, 296 Kenton Road, Harrow, HA3 8DD
- Nature of business
- Construction of commercial buildings (SIC 41201)
- Year end
- 30 April (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 31 August 2026
- Previous names
- Mountside Property Maintenance Limited (until 10 Aug 2017)
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Harrow
Other active building contractors registered in Harrow.
- MP Structural Works Ltd2025
- MS Construction Builders Ltd2026
- MSPC Construction Ltd2022
- Mustang Builders Limited2026
- MVN Building Ltd2026
- MWG Innovations Limited2020
- MWG Management Limited2022
- MWM Building Contractors Ltd2024
All building contractors in Harrow · All trades in Harrow · Builders across the UK
Frequently asked questions
When are Mountside Construction Ltd's accounts due?
Mountside Construction Ltd's next accounts are due at Companies House by 31 January 2027 (in 111 days), covering the period to 30 April 2026.
When is Mountside Construction Ltd's CT600 due?
The CT600 for the period to 30 April 2026 is due at HMRC by 30 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2027.
Is Mountside Construction Ltd still trading?
Mountside Construction Ltd is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does Mountside Construction Ltd do?
Mountside Construction Ltd is registered under Construction of commercial buildings (SIC 41201).
How old is Mountside Construction Ltd?
Mountside Construction Ltd was incorporated on 1 September 2003, 23 years ago.
What is the penalty if Mountside Construction Ltd files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View Mountside Construction Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.